Rate

60-180

Regularity

Irregular

P waves

Chaotic

PRI

Unidentifiable

QRS

0.08-0.12

Rate

60-100

Regularity

Irregular

P waves

Upright and uniform

PRI

0.12-0.20

QRS

0.08-0.12

Rate

None

Regularity

Unidentifiable

P waves

May be present

PRI

None

QRS

None